The invention discloses an assembly for realizing the VoIP gateway analogue switch-in, a VoIP gateway and a process for realizing the VoIP gateway analogue switch-in. The process comprises initializing the VoIP gateway execution hardware resource, identifying the type and the number of an external analogue interface and conducting the switch-in adaption, and realizing the switch-in control between the IP network and the analogue terminal based on the external analogue interface and the analogue/digital conversion. The number of the analogue interface can not be limited by the hardware space of the VoIP gateway through the invention, and the support for the VoIP with high capacity analogue switch-in can be provided, the relative analogue switch-in component can be changed according to the actual demand, thereby flexibly changing the interface property to suit to the different demands of users.